Kafo

Puppet module metadata allows for a "requirements" field, listing supported versions of Puppet with a semantic version range (https://tickets.puppetlabs.com/browse/DOCUMENT-387), e.g.

  "requirements": [
    {
      "name": "puppet",
      "version_requirement": ">= 4.6.1 < 5.0.0" 
    }
  ],

This is usually used when installing modules, but Kafo could enforce it in a similar way to system checks, ensuring that the version of Puppet installed matches the module's supported environments. This would prevent obscure or subtle errors for users.